Updated: 2022/Sep/29

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BN_mod_inverse(3)                   OpenSSL                  BN_mod_inverse(3)



NAME
       BN_mod_inverse - compute inverse modulo n

LIBRARY
       libcrypto, -lcrypto

SYNOPSIS
        #include <openssl/bn.h>

        BIGNUM *BN_mod_inverse(BIGNUM *r, BIGNUM *a, const BIGNUM *n,
                               BN_CTX *ctx);

DESCRIPTION
       BN_mod_inverse() computes the inverse of a modulo n places the result
       in r ("(a*r)%n==1"). If r is NULL, a new BIGNUM is created.

       ctx is a previously allocated BN_CTX used for temporary variables. r
       may be the same BIGNUM as a or n.

RETURN VALUES
       BN_mod_inverse() returns the BIGNUM containing the inverse, and NULL on
       error. The error codes can be obtained by ERR_get_error(3).

SEE ALSO
       ERR_get_error(3), BN_add(3)

COPYRIGHT
       Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (the "License").  You may not use
       this file except in compliance with the License.  You can obtain a copy
       in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.



3.0.12                            2023-05-07                 BN_mod_inverse(3)